Since it's only been in the car for a couple of weeks, i haven't had a chance to verify mileage increase but it may have a HP increase. Unfortunately I don't have a dyno nor did I take it to someone that did.

I cannot determine whether this filter resulted in any performance or mileage increase. I don't dispute the quality and do not regret buying it. I did experience a difference when I upgraded the exhaust and had the new GM tune installed.

K&N Filters are excellent quality. The element arrives pre-oiled, so you just drop it in and go - does not get much easier. A K&N should be the first step for almost any performance modification project.

I bought a K&N Air Filter for my 2007 Honda Civic Si Sedan and my 2007 Pontiac Solstice GXP. Honestly I don't feel any extra power coming out of the Civic but there is definitely an increase in power in the Solstice. Perhaps it is b/c it is turbo charged and has an elevated need for air intake. I think it was a wise investment for both cars and I'm glad I decided to do it.

This is my 5th K&amp;N air filter and I obviously keep going back because I prefer them to the stock filters that come with automobiles. Although I have seen a lot of hype about the performance and economy gain using these filters, I personally haven't experienced it with replacement filters on a Talon GTX, Dodge 2500 Diesel, Dodge 1500 4X4, Honda VTX 1800C, and now a Solstice GXP. They are however excellent filters that are easily cleaned and re-oiled to make them as good as new. The only word of warning I would give is to follow the re-oiling instructions as too much oil can cause issues.
The installation is cut and dry; simply open your breather box, pull out the old filter and drop in the K&amp;N. New filters do not need to be oiled as they come pre-oiled.

The K&amp;N air filter for my Saturn Sky is a perfect fit and installed in about two minutes. This is the first filter change on the car at 7,000 miles. The OE filter was barely dirty, so I expect a long life for the K&amp;N. It's difficlut to judge if the new filter improves performance, since the turbo boost overrides any resistance. But there's definitley no loss of power at low speeds.

Like any K&amp;N this is a high-quality product which fits very well. However if you are hoping to get more horsepower out of the Solstice GXP you'll be disappointed. I noticed an immediate reduction in boost after installing the K&amp;N so I switched back to the stock filter. I am sure that the K&amp;N will give years of good service but at the expense of 1-2 psi of boost.